Hi! > >>>Computer World, January 15, 2004). > >>> > >>> > >>> > >>As Theo said, the AMD buffer overflow "protection" is nothing more than > >>sensible separation of R and X bits per page, fixing a glaring and > >> > >> > > > >Actually it is not "sensible", and it is not separation. > > > >You can have r--, r-x, but you can't have --x. > > > > > But that is *exactly* what is meant by "separation" of R and X. > > I have no idea what you mean by it not being "sensible". Most every CPU > I have ever seen does this except the x86. Someone apparently thought > there was no value in separate R and X bits for the i386 back in the > mid-80s. It was a false economy :) Well.. they are not really separate bits. If they was, you'd have ---, --x, r--, r-x. You can't have --x combination (which is sad for the emulators). I believe that on most sane architectures (m68k at least), you can have all 4 combinations. Pavel -- 934a471f20d6580d5aad759bf0d97ddc
